28123349069 has 2 divisors, whose sum is σ = 28123349070. Its totient is φ = 28123349068.

The previous prime is 28123349057. The next prime is 28123349113. The reversal of 28123349069 is 96094332182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16580425225 + 11542923844 = 128765^2 + 107438^2 .

It is a cyclic number.

It is not a de Polignac number, because 28123349069 - 2²⁸ = 27854913613 is a prime.

It is a super-2 number, since 2×28123349069² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28123348069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14061674534 + 14061674535.

It is an arithmetic number, because the mean of its divisors is an integer number (14061674535).

Almost surely, 2^28123349069 is an apocalyptic number.

It is an amenable number.

28123349069 is a deficient number, since it is larger than the sum of its proper divisors (1).

28123349069 is an equidigital number, since it uses as much as digits as its factorization.

28123349069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 47.

The spelling of 28123349069 in words is "twenty-eight billion, one hundred twenty-three million, three hundred forty-nine thousand, sixty-nine".